@article{Lu2021NonlinearIR,
  title={Nonlinear Invariant Risk Minimization: A Causal Approach},
  author={Chaochao Lu and Yuhuai Wu and Jos{\'e} Miguel Hern{\'a}ndez-Lobato and B. Scholkopf},
  journal={ArXiv},
  year={2021},
  volume={abs/2102.12353}
}